#Upcoming Meetings
* **April 17, 2014, 7:30pm NOTE: THIRD THURSDAY - "Fun With Electric Motors"** Karl Berger, W4KRL will take us back to the 19th Century to explore the fundamentals of direct current motors. Karl will demonstrate an open frame dc commutator motor that has slip rings connected to one rotor winding. This enables observing the rotor voltage on an oscilloscope. We return to the modern era and do all the motor control with an Arduino using Pulse Width Modulated power supplies and Hall-effect current sensors. We will run the motor to synchronous speed and energize the motor with ac, making it run as a synchronous converter to rectify ac by mechanical means. Dolley Madison Library, McLean, VA.
[[dc-shunt-construction.jpg]]
* **May 15, 2014, 7:30pm NOTE: THIRD THURSDAY - Practical Applications for High Speed Mesh Networks, Kieth Elkin, KB3TCB**